Fountain pen



FIG. 1 is a perspective view of a fountain pen showing my new design;

FIG. 2 is a front view thereof, a rear view being a mirror image;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a front view of usage thereof;

FIG. 8 is a right side view of usage thereof; and,

FIG. 9 is a top view of usage. 

CLAIM The ornamental design for a fountain pen, as shown and described. 